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Is the army testing an invisible tank?
science.howstuffworks.com/invisible-tank.htm
An invisible tank could give any military a distinctive edge on the battlefield. Find out how the British army is developing an invisible tank.
Why do you have two lungs but only one heart?
health.howstuffworks.com/human-body/systems/circulatory/two-lungs-one-heart.htm
The two lungs-one heart system evolved because that was all we needed to survive. Learn more about the evolution of the two lungs-one heart system.
What Is the Greenhouse Effect? Is It Inherently Bad?
science.howstuffworks.com/environmental/green-science/question746.htm
We'd be up a creek without Earth's atmosphere and the greenhouse effect it provides, but it turns out that an overactive greenhouse effect can result in a similarly devastating outcome.
Periungual Warts Overview
health.howstuffworks.com/skin-care/problems/medical/periungual-warts.htm
Periungual warts usually form around fingernails and toenails. Learn more about how periungual warts work at HowStuffWorks.
Pityriasis Rosea Overview
health.howstuffworks.com/skin-care/problems/medical/pityriasis-rosea.htm
Pityriasis rosea is a rash that occurs at almost any age. Learn about how pityriasis rosea works at HowStuffWorks.
Top 5 Ways to Prevent Dry Lips
health.howstuffworks.com/skin-care/lip-care/tips/5-ways-to-prevent-dry-lips.htm
There are many ways to prevent dry lips. Visit HowStuffWorks to see the top 5 ways to prevent dry lips.
How Flying Humvees Will Work
auto.howstuffworks.com/flying-humvee.htm
How will flying Humvees work? Read about the Pentagon's plans to make Humvees fly at HowStuffWorks.
How Puerto Rican Traditions Work
people.howstuffworks.com/culture-traditions/national-traditions/puerto-rican-tradition.htm
Many Puerto Rican traditions go back for hundreds of years. Find out about Puerto Rican traditions at HowStuffWorks.
5 Family Traditions for Daughters
people.howstuffworks.com/culture-traditions/family-traditions/5-family-traditions-for-daughters.htm
What are some good family traditions for daughters? Check out 5 family traditions for daughters at HowStuffWorks.
The Basics of Lung Cancer
health.howstuffworks.com/diseases-conditions/cancer/lung/basics-of-lung-cancer.htm
Basics of lung cancer gives an overview of this type of cancer. Learn more about the basics of lung cancer at Discovery Health.